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Abstract

An improved method of complex amplitude modulation (CAM) is proposed for color holographic display with a wide viewing angle. Bandlimited random initial phase is introduced to the CAM method, which overcomes the drawbacks brought by a constant initial phase and maintains the advantages of CAM. Modifications in CAM for color display are also explained. Both simulation and experimental results verify that the proposed method can reconstruct color 3D scenes successfully without the time-consuming process for encoding the computer-generated holograms. Compared with the display via traditional CAM, the results exhibit that the proposed method can reconstruct color 3D scenes with a better viewing effect. Because of the display effect improvement and the high calculation speed, this method can be applied to high performance holographic display.

Figures (5)

The simulation results of 2D scenes, where (a) is the original image, (b), (c) and (d) are reconstructed by method in [19], proposed method, and iteration method (G-S algorithm with 5 loops) respectively.

The schematic of optical experiment. S1, S2 and S3 are shutters, HWP represent half wave plates, Pl are polarizers, BS are beam splitters, Ob is the objective, PH means pin hole, L1, L2 and L3 are lenses, and Ap is an aperture. Objective, pin hole and the collimating lens L1 constitute collimation system to extend the laser beams and collimate it as plane waves. A 4f filter system consist of Fourier lenses L2 and L3 and the aperture for filtering out unwanted orders. A digital camera is applied in the experiment to record the target scene at the view positions P1 and P2.

The optical experimental results by the CAM without/with bandlimited random initial phase, where (a), (b), (d) and (e) are captured at P1, while (c) and (f) are recorded at P2. (a), (c), (d) and (f) are focused on the front object, while (b) and (e) are on the rear one.